Television – Camera – system and detail – Optics
Patent
1991-09-12
1994-08-30
Razavi, Michael T.
Television
Camera, system and detail
Optics
354409, 348334, H04N 5232
Patent
active
053433033
ABSTRACT:
A device for assistance in the optical focusing of the objective of a camera comprises a contour extraction circuit coupled to a marker generator, the output of which is connected to a combination circuit furthermore receiving the video signal from the camera. The resultant composite signal is applied to the viewfinder. Thus a marker, the position of which in the image is a function of the focusing, appears in the viewfinder, the focusing being obtained when the marker is in an extreme position on its axis of shift. The device can be applied notably to the focusing of high-definition television cameras.
REFERENCES:
patent: 4463384 (1984-07-01), Fujikawa et al.
patent: 4566036 (1986-01-01), Kadosawa
patent: 4614975 (1986-09-01), Kaite
patent: 4794459 (1988-12-01), Moberg et al.
patent: 4975547 (1990-12-01), Nakayama et al.
patent: 5003400 (1991-03-01), Murakami et al.
Japan Abstract, vol. 14, No. 425 (E-977) (4368), Sep. 13, 1990, & JP-A-2-162973, Jun. 22, 1990, R. Kuga, "Video Camera Equipment".
Japan Abstract, vol. 7, No. 27 (E-156) (1172), Feb. 3, 1983, & JP-A-57-183186, Nov. 11, 1982, Katsuji Ishikawa, "Focusing Point Detector".
Ho Tuan V.
Razavi Michael T.
Thomson Broadcast
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